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Coating liquid for forming transparent conductive film, substrate with transparent conductive film, and display device

a technology of transparent conductive film and coating liquid, which is applied in the direction of instruments, conductive layers on insulating supports, non-metal conductors, etc., can solve the problems of lowering the transparency or haze of the conductive film, the difficulty of forming a and the conductive film having not only low surface resistance. , to achieve the effect of lowering the electric conduction

Inactive Publication Date: 2004-01-29
CATALYSTS & CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0090] Since the coating liquid for forming a transparent conductive film according to the invention contains conductive fine particles and silica particles, it can form a transparent conductive film having low surface resistance, excellent antistatic properties, excellent electromagnetic blocking properties, high film strength and excellent adhesion to a substrate.[0091] According to the invention, a substrate with a transparent conductive film having excellent adhesion to the substrate, high film strength and excellent electrical conduction, and a display device having a front side plate constituted of the substrate with a transparent conductive film can be provided.

Problems solved by technology

In case of the conventional conductive oxide such as Sb-doped tin oxide or Sn-doped indium oxide, therefore, there resides a problem that it is difficult to form a conductive film having not only low surface resistance and excellent electromagnetic blocking properties but also excellent anti-reflection properties.
However, the conductive film formed by the use of such a film-forming coating liquid has high intergranular resistance and is not decreased in the surface resistance in some cases because the metallic fine particles are in contact with one another through the stabilizer in the coating film.
However, if the film is burned at a high temperature to decompose and remove the stabilizer, fusion or coagulation of the metallic fine particles takes place to cause lowering of transparency or haze of the conductive film.
Further, in case of a cathode ray tube, a problem of film deterioration occurs when the film is exposed to high temperatures.
As a result, conductivity or light transmittance of the film is lowered to bring about a problem that the display device lacks reliability.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

Preparation of Dispersion of Silica Particles (A)

[0093] To 2000 g of a silica sol (SI-550, available from Catalysts & Chemicals Industries Co., Ltd., average particle diameter: 5 nm, SiO.sub.2 concentration: 20% by weight, Na in silica: 2700 ppm), 6000 g of ion exchange water was added, then 400 g of a cation exchange resin (SK-1BH, available from Mitsubishi Chemical Corporation) was added, and they were stirred for 1 hour to perform dealkalization. After the cation exchange resin was separated, 400 g of an anion exchange resin (SANUPC, available from Mitsubishi Chemical Corporation) was added, followed by stirring for 1 hour to perform deanionization.

[0094] Subsequently, 400 g of a cation exchange resin (SK-1BH, available from Mitsubishi Chemical Corporation) was added again, followed by stirring for 1 hour to perform dealkalization. Thus, a dispersion of silica particles (A) having a SiO.sub.2 concentration of 5% by weight was prepared. The Na content in the silica particles was 2...

example 2

Preparation of Coating Liquid (2) for Forming Transparent Conductive Film

[0112] A coating liquid (2) for forming a transparent conductive film having a solids concentration of 0.4% by weight was prepared in the same manner as in Example 1, except that the dispersion of metallic fine particles (1), the dispersion of silica particles (A) and the polar solvent were mixed in such amounts that the WB / WA weight ratio became 0.05.

Preparation of substrate (2) with Transparent Conductive Film

[0113] A substrate (2) with a transparent conductive film was obtained in the same manner as in Example 1, except that the coating liquid (2) for forming a transparent conductive film was used.

[0114] The surface resistivity, haze, bottom reflectance, luminous reflectance and adhesion properties of the resulting substrate (2) with a transparent conductive film were evaluated.

[0115] The results are set forth in Table 1.

example 3

Preparation of Coating Liquid (3) for Forming Transparent Conductive Film

[0116] A coating liquid (3) for forming a transparent conductive film having a solids concentration of 0.4% by weight was prepared in the same manner as in Example 1, except that the dispersion of metallic fine particles (1), the dispersion of silica particles (A) and the polar solvent were mixed in such amounts that the WB / WA weight ratio became 0.25.

Preparation of Substrate (3) with Transparent Conductive Film

[0117] A substrate (3) with a transparent conductive film was obtained in the same manner as in Example 1, except that the coating liquid (3) for forming a transparent conductive film was used.

[0118] The surface resistivity, haze, bottom reflectance, luminous reflectance and adhesion properties of the resulting substrate (3) with a transparent conductive film were evaluated.

[0119] The results are set forth in Table 1.

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Abstract

Disclosed is a coating liquid for forming a transparent conductive film, comprising conductive fine particles having an average particle diameter of 1 to 200 nm, silica particles having an average particle diameter of 4 to 200 nm and a polar solvent. The silica particles are in the form of chain silica particles having 2 to 10 silica particles on an average being connected. The content of an alkali in the silica particles is not more than 1000 ppm in terms of an alkali metal M. Also disclosed is a substrate with a transparent conductive film, comprising a substrate, a transparent conductive fine particle layer formed on the substrate and containing conductive fine particles having an average particle diameter of 1 to 200 nm and silica particles having an average particle diameter of 4 to 200 nm and / or chain silica particles having 2 to 10 silica particles on an average being connected, and a transparent film provided on the transparent conductive fine particle layer and having a refractive index lower than that of the transparent conductive fine particle layer. A display device using the substrate with a transparent conductive film is further disclosed. The coating liquid for forming a transparent conductive film is capable of forming a transparent conductive film having low surface resistance, excellent antistatic properties, excellent electromagnetic blocking properties, high film strength and excellent adhesion to a substrate.

Description

[0001] The present invention relates to a coating liquid for forming a transparent conductive film. The present invention also relates to a display device having a transparent conductive film.[0002] For the purpose of preventing electrostatic charging and reflection on the surfaces of transparent substrates of display panels, such as cathode ray tubes, fluorescent indicator tubes and liquid crystal display plates, transparent films having antistatic function and anti-reflection function have been conventionally formed on these surfaces.[0003] In recent years, influences of electromagnetic waves released from the cathode ray tubes or the like on human bodies have been put into problem, and in addition to the prevention of electrostatic charging or reflection, it has been desired to block the electromagnetic waves and the electromagnetic fields formed with release of the electromagnetic waves.[0004] One method to block the electromagnetic waves is a method of forming a conductive film...

Claims

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Application Information

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IPC IPC(8): B32B7/02C08K3/08G02F1/1345C08K3/10C08K3/36C09D1/00C09D5/24C09D183/02C09D183/04G02B1/10G02B1/11G02B1/111G02B1/14G02B1/16H01B1/00H01B1/16H01B1/18H01B1/20H01B1/22H01B5/14H01J29/88
CPCC08K3/08C08K3/10C08K3/36C09D1/00H05K9/0096C09D183/02C09D183/04H01B1/16H01B1/18C09D5/24H01J29/18
Inventor MATSUDA, MASAYUKIKUMAZAWA, MITSUAKIISHIHARA, YOICHIHIRAI, TOSHIHARUKOMATSU
Owner CATALYSTS & CHEM
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